any model/year to watch out for???

[Clockwork]

First off, let me say I'm currently reading through the pages of the E53 area researching/noting problems with the E53, but I'm just wondering if there is a census on if any year/model was particularily bad for issues?

I'm looking at buying an E53 in next 4 months (if not sooner) and just would like a heads up if this year xxx or this model xxx has a bad transmission problem, or engine issue, or suspension problem or electrical issue, etc.

I will continue reading through the forum to make my own decisions too.
Clockwork

PS: glad there is a forum dedicated to the E53. certinally opens a persons eyes to experiences had with these fine rides.